The Germans have no destroyer present, therefore the defending air units can not hit the sub, and of course the sub can never hit planes. Think of it in terms of the combined arms rule, air units can only hit subs if they are combined with at least 1 participating destroyer, the difference with this particular combined arms is that it works while attacking and defending. In the scenario that you described, the sub would destroy the remaining transport without rolling and the defending fighters can do nothing.
Filling Transports and leaving question
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If I have a Transport in the Sea-Zone adjacent to Eastern USA (has a port) / Central USA (no sea port) can I load units from both the Central and Eastern USA on to it ?
If so can I then use the port in Eastern USA to move three spaces and unload in morocco ? -
A naval base isn’t needed to load transports. A transport can take 2 units from 2 different territories as long as the territory is adjacent to the transport’s sea zone. It can also take 1 unit, move into another sea zone, and load another unit from an adjacent territory.
And yes, you can use Eastern USA’s Naval base to move the transports to offload in Morocco. Naval Bases serve all friendly ships in sea zones adjacent to the territory that the Naval base is on.





